Currently ecoupons are generally good for a certain online store rather than a manufacturer's coupon good at any online store. As such, they are a bit easier to track. You can try to ensure that each customer only redeems one coupon if you match up shipping and billing addresses. Or you can set up a coupon which says it's only good for the first "x" customers. There are web sites set up to trade ecoupons. If you're trying to use coupons to track spending profiles, then trading ecoupons is going to ruin your data. If, however, you're using an ecoupon to bring new customers to your store then set the discount low enough that you won't lose money if the coupon is traded online.
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